So there's no DC power getting to the motherboard from the PDB it sounds like?
Can you try pulling out one of the PSUs and powering up from the other?
Pull out PSU0, try powering up via PSU1, and vice versa.
Maybe the PDB is on the fritz and the house event was just a fluke.
Do you have a...
It's a LSI 2208 that can do 0/1/10/5/50/6/60.
RMS25CB080 is the model
However, you need a Intel server board, as it uses their SIOM connector.
See page 3 of the slides here -- this card goes flush and parallel on the board, so you can use it without a riser in a 1u.
Intel® Integrated RAID...